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Atomic Radii and Ionization Energy (Group 1)

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Question

why is the atomic radii of the elements of 1st transition series lower than the corresding atomic radii of 2nd and 3rd transition series?

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Solution

Atomic radii of 1^st transition series is lower than the 2^nd and 3^rd series as a new principal shell is added in each row. As a result of this new shell the atomic radii increases as we go down the group.

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Q. Why the atomic radii of the second and third transition series are almost same?

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^{'} d^{'}

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